Answer:
Li2CO3+CaCl2=CaCO3+LiCl
i have a quiz yall help
How many moles are in a 18 L tank of nitrogen gas at STP?
Answer:
12
Explanation:
i feel like its 12 because moles are medium sized but are they adult moles or baby moles or growing moles
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 0.803moles of nitrogen gas are there in a 18 L tank of nitrogen gas at STP.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
number of moles of any ideal gas =given volume ÷Volume occupied by one mole of a ideal gas at STP
Volume occupied by one mole of a ideal gas at STP=22.4L
given volume of nitrogen gas= 18 L
substituting all the given values in the above equation we get,
number of moles of nitrogen gas =18 L ÷22.4L
number of moles of nitrogen gas =0.803moles
Therefore, 0.803moles of nitrogen gas are there in a 18 L tank of nitrogen gas at STP.
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What is the molar mass of Mn2Se7 ?
A.) 601.34 g/mol
B.) 542.50 g/mol
C.) 662.60 g/mol
Answer:
C. 662.60
Explanation:
the mass of Mn is about 54 grams/mol, (multiply that by 2 since there are 2 Mn's).
the mass of Se is about 79 grams/mol, so multiply that by 7
if you add them, you get 662.60 (approxamitly)
Answer:
C) 662.60
Explanation:
~~55*2 + 79*7 = 110 + 553 = 663 (~~662.60)
Drag the tiles to the correct boxes to complete the pairs.
Nelly goes shopping on a weekday. She picks up protein powder so she can make a protein shake. She buys a double cheeseburger on her way home. She eats part of it, and then stores the rest of it in a paper bag so she can eat it later. Later in the day, she puts together several small packages of candies as gifts for her nieces and nephews. She labels each package and sends it through the mail.
Match each item or action with the organelle it could represent.
Protein shake -------------> Ribosome
Paper bag -------------> Vacuole
Packing candles -------------> Golgi Apparatus
im not 100% sure if paper bag and packing candles is correct.
How many mole are in 14.5 grams of neon please explain
Answer:
0.725 moles
Explanation:
Use the mole = mass/mr equation to find the moles.
Mole = 14.5/20 (Neon's Mr) = 0.725 Moles
Compare and contrast stomata with the pores found in liverworts. Compare and contrast stomata with the pores found in liverworts. Stomata doesn't allow CO2 to diffuse and cannot be closed if conditions become dry. Liverwort pores allow gas exchange and cannot be closed either if conditions become dry. Stomata allow CO2 to diffuse and can close to minimize water loss. Liverwort pores doesn,t allow gas exchange and cannot be closed if conditions become dry. Stomata allow CO2 to diffuse and can close to minimize water loss. Liverwort pores allow gas exchange and cannot be closed if conditions become dry. Stomata allow CO2 to diffuse and cannot be closed if conditions become dry. Liverwort pores allow gas exchange and can close to minimize water loss.
Answer: Stomata allow CO2 to diffuse and can close to minimize water loss. Liverwort pores allow gas exchange and cannot be closed if conditions become dry.
Explanation:
In the kingdom plantae, the liverworts belong to the phylum Bryophyta. A liverwort has a simple structure, ribbon- like body, that lies flat on the ground and is attached to the soil by many rhizoids. They grow in damp places on land and are capable of controlling gaseous exchange through the pores found on their leaf surfaces. Liverworts are non- vascular plants therefore they lack stomata. Unlike the stomata of vascular plants which close in dry weather, the air pores of liverworts remain open all the time. Liverworts cannot control their water loss (transpiration) through the pores.
Stomata are found in the epidermal layer of leaves in vascular plants. The opening and closing of stomata, through the help of the guard cells, control the flow of gases in and out of the leaves. This control is necessary to prevent excessive loss of water as vapour from the plant body throughout transpiration. Changes in the solute concentration of the guard cells cause water to flow in and out of the leaf epidermal cells.
Therefore, to COMPARE the stomata with pores of liverworts, they both allow gaseous exchange but in CONTRAST, stomata has the ability to control water loss as it can open and close while the pores lack this ability.
Ammonia (NH3) dissolved in water is heated in a beaker. If initially there had been 60 grams dissolved in 100 grams of water, what would happen if the temperature reached 90℃ and why? A. The solution would become supersaturated and the ammonia would all remain dissolved . B. The solution would become saturated but the amount of ammonia dissolved would remain the same . C. about 50 more grams of ammonia would be able to dissolve as the solution has become unsaturated . D. about 50 grams of ammonia would come out of solution as the temperature caused the solubility to decrease .
Answer:
C. About 50 more grams ammonia would be able to dissolve as the solution has become unsaturated
Explanation:
From the question, we have;
The mass of ammonia dissolved in water = 60 grams
The mass of the water solvent which dissolves the ammonia = 100 g
The temperature to which the ammonia water solution is raised = 90°C
Therefore, given that the solubility of a solute in a solvent increases with temperature, when the temperature is raised, we have, that the solution will more unsaturated and will be able to dissolve more ammonia, therefore, option 'C' is the most correct option that corresponds with the relationship of temperature and solubility
How many joules are required to melt 100 grams of water? The heat of
fusion of water is 6.01 kJ / mole.
if life had existed during thie won the fossils probably would not have survived because
Answer:
because life would have use fossil for their benefits.
Which set of elements represents a period within the Periodic Table?
H, He, Ar , Xe , Rn ,
N, P, As, Sb , Bi
K, V, Fe, Ga , Kr
La, Pa, Sm, Tb, Yb
What happens during high tide?
a.The tidal range is at its minimum in a location.
b.The tidal range is at its maximum in a location.
c.The water level in the ocean rises to above average water level.
D.The water level in the ocean drops to below average water level.
Answer: c
Explanation:
A gas has a volume of 900.0 mL at 35.0°C and 400.0 atm. What would the volume of the gas be at 258 °C and 700.0 atm of pressure?
Answer:
887 ML
Explanation:
yup
how many Na atomd are shown in the reactants
Answer:
On the reactant side, there are two H atoms and two O atoms
You add 28 grams of carbon. You find the actual yield to be 181.2 grams of CO2. What is the percent yield of CO2?
Answer:
79.14%
Explanation:
Given the equation : 2Fe2O3 + 3C 4Fe + 3C02
The theoretical yield of CO2 ; is 102.6g
Actual yield = 81.2 gram
Percentage yield = (actual yield / theoretical yield) * 100%
Percentage yield = (81.2 / 102.6) * 100%
Percentage yield = 0.7914230 * 100%
Percentage yield = 79.14%
Hence, tbe percentage yield of CO2 is 79.14%
all about Henry Mosléy?
Answer:
Henry Moseley was an English physicist whose contribution to the science of physics was the justification from physical laws of the previous empirical and chemical concept of the atomic number.
As the randomness of a system increases, the entropy of the system:
A) decreases
B) increases
C) remains the same
Answer:
it most likely increases
how many periods are there in the modern periodic table of elements?
Answer:
There are seven periods in the modern periodic table.
Answer:
Seven periods
Explanation:
There are seven periods in the periodic table, with each one beginning at the far left. A new period begins when a new principal energy level begins filling with electrons. Period 1 has only two elements (hydrogen and helium), while periods 2 and 3 have 8 elements.
Different substances have....
A.the same properties
B. different properties
C.similar properties
D.all properties
Answer:
Different properties
Explanation:
They are different.
How can we prepare a weak acid from
carbondioxide ? Write with chemical equation
SAP
Answer:
H2O+CO2--------> H2CO3
Answer:
Carbonic acid- H2CO3
Explanation:
Water+co2 gives H2CO3
H2CO3 is an acid, which Carbonic acid that is H2CO3 is a weak acid
It decomposes into CO2 and H2O
Which statement is true about this fuel cell?
It is self contained like a battery.
It continually needs to be charged.
It has an electrolyte that acts as a salt bridge.
It does not require the input of fuels from an outside source.
The statement which is true about the fuel cell is that It has an electrolyte that acts as a salt bridge.
What is Fuel cell ?A fuel cell is an electrochemical cell that converts the chemical energy of a fuel (often hydrogen) and an oxidizing agent (often oxygen) into electricity.
The fuel cell has an electrolyte that acts as a salt bridge.
As electrolytes are nothing but the salts which are present at the inner side of the U-Tube considered as Salt bridge present in fuel cell.
In this way, Fuel cell has electrolyte that acts as a salt bridge.
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Name three uses for mercury.
USES OF MERCURY
used in thermometer as it is liquid at room temperature.It is used in batteries , florescent lightit is also used in dental fillingAt a hydroelectric power plant, potential energy is changed into kinetic energy. The kinetic energy is then transformed into electrical energy. i What is the source of the energy that turns the turbine in the power plant? Chemical energy of water molecules as they fall Gravitational potential energy of water behind the dam Elastic potential energy of the water molecules as they bounce over the dam Electrical energy from power lines that connect the hydroelectric plant to a grid
Answer:
Gravitational potential energy of water behind the dam
Explanation:
Energy can be defined as the ability (capacity) to do work. The two (2) main types of energy are;
a. Gravitational potential energy (GPE): it is an energy possessed by an object or body due to its position above the earth.
b. Kinetic energy (KE): it is an energy possessed by an object or body due to its motion.
Hydroelectric power plant refers to a renewable source of energy used for the generation of electricity, through the use of powerful hydraulic steam turbines operating at high voltage and are being driven by the energy acquired by water falling from a height and flowing through a penstock (pipe) i.e the mechanical energy (gravitational potential energy + kinetic energy).
At a hydroelectric power plant, potential energy is changed into kinetic energy. The kinetic energy is then transformed into electrical energy.
The source of the energy that turns the turbine in the power plant is Gravitational potential energy of water behind the dam, usually from streams or rivers.
HELPPPP PLEASEE 50 POINTS
A graph labeled Solubility versus Temperature for a variety of salts has Temperature from 0 to 100 on the x axis and solubility in grams per 100 grams of water from 0 to 90 on the y axis. 5 solutes are shown. All data are approximate. Upper N a Upper C l starts at (0, 35) and rises evenly across the graph to (100, 40). Upper N a Subscript 2 Baseline Upper H Upper A s Upper O Subscript 4 Baseline starts at (0, 8), and rises steadily through (30, 38) to (80, 85). Upper B a (Upper N Upper O Subscript 3) Subscript 2 Baseline starts at (0, 5) and rises steadily across the graph to (100, 33). Upper N a Subscript 2 Baseline Upper S Upper O Subscript 4 Baseline starts at (0, 5), curves up steeply to (30, 50), and declines slowly to (100, 43). Upper C e Subscript 2 Baseline (Upper S Upper O Subscript 4) Subscript 3 Baseline times 9 Upper H Subscript 2 Baseline Upper O starts at (0, 19), falls to (20, 10), and continues to decline to (100, 0).
What is the solubility of Na2HAsO4 at 60°C?
20 g/100 mL of water
46 g/100 mL of water
65 g/100 mL of water
70 g/100 mL of water
Answer:
65 g/100 mL of water
Explanation:
Answer:
65g/100ml of water.
Explanation:
Edge 2021.
How are a rainforest and a desert different?
Answer:
Difference between Desert Plants and Rainforest Plants. The deserts are very dry land areas that can be hot or cold and experience very less rainfall. On the other hand, rainforests receive an enormous amount of rain. Both are homes to a variety of plants.
Explanation:
5) Which element has the lowest first ionization energy?*
Li
K
Na
Answer:
K
Explanation:
Ionisation energy is the energy required for electron loss and the higher the occupied energy levels=higher atomic radius=the lower the ionisation energy thus k=2.8.8.1
Na=2.8.1
Li=2.1
The balanced chemical equation below shows the reaction between nitrogen (N2) and hydrogen (H2) to form ammonia (HN3).
N2 + 3H2 → 2NH3
If 10.0 grams of nitrogen reacts with hydrogen to form 12.0 grams of ammonia, then how many grams of hydrogen were used in this
Answer:
hope u umderstood ! if explanation needed then conta t
Nitrogen and hydrogen react to form ammonia and is a combination reaction. The grams of hydrogen used in the reaction with nitrogen to form ammonia is 2.0 grams.
What is mass in grams?Mass is the weight or the product of the volume and density of the substance. It can be calculated as, [tex]\rm volume \times density.[/tex]
Given,
Mass of nitrogen = 10.0 grams
Mass of ammonia = 12.0 grams
Mass of hydrogen = x gram
Solving for x:
[tex]\begin{aligned}\rm 10 + x &= 12\\\\\rm x &= 12.0 - 10.0\\\\&= 2.0 \;\rm grams\end{aligned}[/tex]
Therefore, 2.0 grams of hydrogen is required to react with 10.0 grams of nitrogen to produce 12.0 grams of ammonia.
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How to calculate the number of moles
Answer:
1. The formula for the number of moles formula is expressed as.
2. Given.
3. Number of moles formula is.
4. Number of moles = Mass of substance / Mass of one mole.
5. Number of moles = 95 / 86.94.
electrons are transferred in forms of what
Answer:
ionic bonds
Explanation:
Is a 3.3% solution dilute or concentrated?
Dilute
Concentrated
Answer:
Dilute
Explanation:
A concentrated solutions is a one which has relatively large amount of dissolved solute in the solution whereas a dilute solution is a one which has relatively lower concentration of dissolved solute.
In the given solution there is only 3.3% of solute. So, we can say that the given solution is a dilute solution. However, these terms are relative.
What is the state change of a gas to a liquid is called?
Answer:The process in which a gas changes to a liquid is called condensation. Other examples of condensation are shown in Figure below. A gas condenses when it is cooled below its boiling point.
Explanation:
There are 4 phases for h20 solid liquid vapour and gas.
In the vacuum of space there are only 2 phases solid and gaseous, both liquid and vapour cannot exist in the absolute freezing temperature of the vacuum of space and crystalise instantly.
Watch a space shuttle dump water in space and it instantly freezes, and when in direct sunlight instantly turn to its gaseous phase and becomes invisible to the naked eye by the process of sublimation.
When h20 freezes in the shadow of the shuttle to ice crystals they instantly sublimate to the a gaseous state when they come into contact with direct sunlight.
You can see all 4 phases if you place ice cubes [ solid phase ] in a pan on a stove, the Solid beComes liquid [ liquid phase ]and the liquid becomes a gas in the bottom of the pan when the water boils, [ gaseous phase ] the bubbles coming up from the bottom are the instant phase change from liquid to gas, when the gas bubbles break the surface of the water and the gas comes into contact with the cooler air the gas instantly starts to condense to water droplets i.e. the vapour phase
You can see through the bubbles because h20 in its gaseous phase is invisible to the naked eye.
Gaseous h20 is hot dry and invisible
Vaporous h20 is warm wet and visible
Gaseous h20 is known as a condensing gas in physics because it condenses obviously, condensing gases are also known as optically active gases or radiatively active gases.
Hope this helps all the 3 phase numpties who think vapour i.e. water droplets is actually gas, it isnt or it wouldn’t be called vapour it would be called gas.
Liquid water has to reach its boiling point before it will phase change to its gaseous phase.
Vapor has to boil before the water droplets will phase change to a gaseous state, steam is not gas it is condensing gas i.e. vapour at a lower temperature than boiling point.
hope this helps have a nice day
I need help!
And please give me an ACTUAL answer and not random spam words please!
Thanks!
What is[OH-] of a solution
with a pH of 11.3?
Answer in M
Answer:
2 ×10^-3
Explanation:
pH + pOH = 14
pOH = 14-11.3 = 2.7
[OH-] = 10^-pOH = 10^-2.7 = 2×10^-3 M